package com.gdut.seckill.controller;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.wf.captcha.ArithmeticCaptcha;
import com.gdut.seckill.config.AccessLimit;
import com.gdut.seckill.exception.GlobalException;
import com.gdut.seckill.pojo.*;
import com.gdut.seckill.rabbitmq.MQSender;
import com.gdut.seckill.service.IGoodsService;
import com.gdut.seckill.service.IOrderService;
import com.gdut.seckill.service.ISeckillOrderService;
import com.gdut.seckill.utils.JsonUtil;
import com.gdut.seckill.vo.GoodsVo;
import com.gdut.seckill.vo.RespBean;
import com.gdut.seckill.vo.RespBeanEnum;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.TimeUnit;

@Controller
@RequestMapping("/seckill")
@Slf4j
public class SecKillController implements InitializingBean {
    @Autowired
    private IGoodsService goodsService;
    @Autowired
    private ISeckillOrderService seckillOrderService;
    @Autowired
    private IOrderService orderService;
    @Autowired
    private RedisTemplate redisTemplate;
    @Autowired
    private MQSender mqSender;
//    @Autowired
//    private RedisScript<Long> script;

    private Map<Long,Boolean> EmptyStockMap = new HashMap<>();

    /**
     * 秒杀
     * 优化前：10000 314.1
     * @param model
     * @param user
     * @param goodsId
     * @return
     */
    @RequestMapping("/doSeckill2")
    public String doSecKill2(Model model, User user, Long goodsId){
        if(user==null){
            return "login";
        }
        model.addAttribute("user",user);
        GoodsVo goods = goodsService.findGoodsVoByGoodsId(goodsId);
        //判断库存
        if(goods.getStockCount()<1){
            model.addAttribute("errmsg", RespBeanEnum.EMPTY_STOCK.getMessage());
            return "secKillFail";
        }
        //判断是否重复抢购
        SeckillOrder seckillOrder =
                seckillOrderService.getOne(new QueryWrapper<SeckillOrder>()
                        .eq("user_id", user.getId()).eq("goods_id", goodsId));
        if(seckillOrder!=null){
            model.addAttribute("errmsg",RespBeanEnum.REPEATE_ERROR);
            return "secKillFail";
        }
        Order order = orderService.secKill(user,goods);
        model.addAttribute("order",order);
        model.addAttribute("goods",goods);
        return "orderDetail";
    }

    /**
     * 秒杀
     * 优化前qps：10000 314.1
     * 缓存qps：30000 1127.9
     * 优化QPS：30000 3485.9
     *
     * @param path
     * @param user
     * @param goodsId
     * @return
     */
    @RequestMapping(value = "/{path}/doSeckill",method = RequestMethod.POST)
    @ResponseBody
    public RespBean doSecKill(@PathVariable String path, User user, Long goodsId){
        if(user==null){
            return RespBean.error(RespBeanEnum.SESSION_ERROR);
        }

        ValueOperations valueOperations = redisTemplate.opsForValue();
        boolean check = orderService.checkPath(user,goodsId,path);
        if(!check){
            return RespBean.error(RespBeanEnum.REQUEST_ILLEGAL);
        }

        //判断是否重复抢购
        SeckillOrder seckillOrder =
                (SeckillOrder) redisTemplate.opsForValue().get("order:" + user.getId() + ":" + goodsId);
        if(seckillOrder!=null){
            return RespBean.error(RespBeanEnum.REPEATE_ERROR);
        }
        //内存标记，减少redis的访问
        if(EmptyStockMap.get(goodsId)){
            return RespBean.error(RespBeanEnum.EMPTY_STOCK);
        }
        //预减库存  decrement：每调用一次，递减
        Long stock = valueOperations.decrement("seckillGoods:" + goodsId);

        //不使用该lua脚本获取stock，因为其导致的超卖问题没有解决。
//        Long stock =
//                (Long) redisTemplate.execute(script, Collections.singletonList("seckillGoods:" + goodsId), Collections.EMPTY_LIST);

        if(stock<0){
            EmptyStockMap.put(goodsId,true);
            valueOperations.increment("seckillGoods:" + goodsId);
            return RespBean.error(RespBeanEnum.EMPTY_STOCK);
        }

        SeckillMessage seckillMessage = new SeckillMessage(user,goodsId);
        mqSender.sendSeckillMessage(JsonUtil.object2JsonStr(seckillMessage));

        return RespBean.success(0);





        /*
        GoodsVo goods = goodsService.findGoodsVoByGoodsId(goodsId);
        //判断库存
        if(goods.getStockCount()<1){
            return RespBean.error(RespBeanEnum.EMPTY_STOCK);
        }
        //判断是否重复抢购
//        SeckillOrder seckillOrder =
//                seckillOrderService.getOne(new QueryWrapper<SeckillOrder>()
//                        .eq("user_id", user.getId()).eq("goods_id", goodsId));
        SeckillOrder seckillOrder =
                (SeckillOrder) redisTemplate.opsForValue().get("order:" + user.getId() + ":" + goodsId);
        if(seckillOrder!=null){
            return RespBean.error(RespBeanEnum.REPEATE_ERROR);
        }
        Order order = orderService.secKill(user,goods);
        return RespBean.success(order);
        */
    }

    /**
     * 获取秒杀结果
     * @param user
     * @param goodsId
     * @return orderId 成功,-1 失败,0 排队中
     */

    @RequestMapping(value = "/result",method = RequestMethod.GET)
    @ResponseBody
    public RespBean getResult(User user,Long goodsId){
        if(user==null){
            return RespBean.error(RespBeanEnum.SESSION_ERROR);
        }
        Long orderId = seckillOrderService.getResult(user,goodsId);
        return RespBean.success(orderId);
    }

    /**
     * 获取秒杀地址
     * @param user
     * @param goodsId
     * @return
     */
    @AccessLimit(second=5,maxCount=5,needLogin=true)
    @RequestMapping(value = "/path",method = RequestMethod.GET)
    @ResponseBody
    public RespBean getPath(User user, Long goodsId, String captcha, HttpServletRequest request){
        if(user==null){
            return RespBean.error(RespBeanEnum.SESSION_ERROR);
        }

        boolean check = orderService.checkCaptcha(user,goodsId,captcha);
        if(!check){
            return RespBean.error(RespBeanEnum.ERROR_CAPTCHA);
        }
        String str = orderService.createPath(user,goodsId);
        return RespBean.success(str);
    }

    @RequestMapping(value = "/captcha",method = RequestMethod.GET)
    public void verifyCode(User user, Long goodsId, HttpServletResponse response){
        if(user==null||goodsId<0){
            throw new GlobalException(RespBeanEnum.REQUEST_ILLEGAL);
        }
        //设置请求头为输出图片的类型
        response.setContentType("image/gif");
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        //生成验证码，将结果放在redis
        ArithmeticCaptcha captcha = new ArithmeticCaptcha(130, 32, 3);
        redisTemplate.opsForValue().set("captcha:"+user.getId()+":"+goodsId,captcha.text(),300, TimeUnit.SECONDS);
        try {
            captcha.out(response.getOutputStream());
        } catch (IOException e) {
            log.error("验证码生成失败",e.getMessage());
        }
    }

    /**
     * 系统初始化，把商品库存数量加载到redis
     * @throws Exception
     */
    @Override
    public void afterPropertiesSet() throws Exception {
        List<GoodsVo> list = goodsService.findGoodsVo();
        if(CollectionUtils.isEmpty(list)){
            return;
        }
        list.forEach(goodsVo ->{
                redisTemplate.opsForValue().set("seckillGoods:"+goodsVo.getId(),goodsVo.getStockCount());
                EmptyStockMap.put(goodsVo.getId(),false);
            }
        );


    }
}
